i too, am rather new to this stuff, so i'm probably the last person that should be giving advice... but....a friend let me borrow his seaclone 150 while i went shopping for a skimmer...
it was essentially worthless. in a curing tank, i got nearly no gunk in the collection cup. occasionally, there'd be an air burp, and it would push clear water up into the cup, but that's about it.
seems like there's a lot of folks that have done mods to the unit, and gotten some good out of it, but it doesn't seem to be a skimmer that ever reviews very well.
not exactly sure what i would recommend, tho as...after two weeks of research and carefully weighing the pros and cons from every angle i could on skimmers....i just gave up, and ordered a no-name home made setup off of ----. something about paying $400 for a couple of PVC tubes just wasn't making sense to me, and...nothing else in a sane price range seemed like it was any better suited to be a skimmer than it was to be a bong. i got lucky, (this thing pulls green muck out of the tank) but i'm not sure it's advice i'd want to tell anybody else to follow.